I have now sent in a request to the pool builder for an over sized sand filter and he came back with the TR-140 which is bigger yet than the above mentioned TR-100. He pointed out that if they install the Valet 3 cleaning system (which the pool installer is going to warrantee the nozzles for life) that sand would be entering the zone changing mechanism and cause premature wear on those parts. The zone changer does not have the installer lifetime warrantee. I guess all the more reason to go with a Polaris 280 instead with just a Polaris warrantee. Any automatic cleaner any better than the other for use with a sand filter? Does anyone know the different energy requirements for using something like a Valet 3 and a Polaris?